Air-heater.



T. Cl MAXFIELD.

AIR HEATER.

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1.6. MAXFIELD.

Am HEATER.

APPLICATION FILED FEB. 2G. 1915.

Patented 1100.17, 1918.

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narran sratrnls THOMAS C. MAXFIELD, OF NEW YORK, N. Y.

AIR-HEATER.

Specification of Letters Patent.

)Patented Dec. 17, 1918.,

Application filed February 26, 1915. Serial No. 10,832.

To all whom t may concern:

Be it known that I, THOMAS C. MAxrInLD, residing at and whose post-office address is LL65 West 157th street, city of New York`r in the county of New York and State of New York, have invented certain new and useful Improvements in Air-Heaters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it .appertains to make and use the same.

My invention relates to that type of air heaters in which the clear atmospheric air is heated and supplied to the rooms of a house or other building.

The advantages of supplying pure heated air, instead of introducing into a room the products of combustion laden with coal gas, are well understood, and heating systems in which pure air has been passed through pipes or tubes which intersect the line of travel of the products of combustion from the furnace to the chimney, have been successfully adopted andl used. rI`hey accomplish the heating by the single transfer of the heat units from the products of combustion to the air instead of having to create steam for the heating of the air.

The object of my invention is to improve the construction of air heaters of the character referred to, primarily with the object of enabling them to be made in small sizes for domestic use and at the same time insure the effective heating of a quantity of air, relatively to the fuel consumed, which will substantiallyequal the amount of air heretofore heated by large constructions having extended heating surfaces. I also provide a substantially free and uninterrupted passage for the air so that the air, flowing without undue increase in velocity, may have full opportunity to absorb the heat from the products of combustion.

I also arrange the heating tubes so that they completely inclose the fiowing column of air and I provide a novel arrangement of the tubes by which opportunity is afforded for them to give up practically all of their heat to the air before reaching the chimney.

In the accompanying drawing, Figure 1 is a front elevation partly broken away. Fig. 2 is a partial section and elevation and Fig. 3 is a partial plan and section.

Referring to the drawing, I have shown a casing l inclosing the entire heater and containing the'furnace 2. Air ducts 3 are shown entering thecasing 1, at or near its lower end. The air passes through the casing to liues 4 adapted to lead tothe rooms to be supplied with the heatedair. y,Ihe atmospheric air thus has-a practically `,unrestricted passage through the casing 1;-

I have shown the fire box''of the furnace 2 in connection with the chimney 6 by means of a novel arrangement of tubes. From the top of the lire box extends a products of combustion flue 'i' having outlet tubes 12 in communication therewith. These f tubes' are shown slanting upward from the'fiue- -7 at an angle of about 45 degrees andv entering heads 9 vertically disposed within Ithe casing 1 near the sides thereof. K

Just above the inner ends of the series of tubes 12 the fiue 7 is shown formed with a battle plate 10 which insures the passage of all of the gases through the tubes. Within the heads 9 the gases pass downward and enter a second series of tubes S which are disposed, relatively to the heads, substantially the same as the tubes 12 relatively to the iiue 7. The gases pass upward through the tubes 8 and again enter the flue 7 above the baffle plate 10 and then out through the chimney 6. The tubes 8 and 12 may, if desired, consist respectively of a single iiue instead of a plurality of tubes as shown. Above the battle plate 10 the iue is divided longitudinally by a central wall 13.

At the lower portion of the heads 9, I have indicated clean out openings 14e which permit of readily emptying the heads of the soot that may fall therein and out of the iues 8. r1`he soot collecting within the fines 12 falls back into the ire box.

I provide for shutting off some of the tubes while maintaining the passages through others. This is of advantage when in severe weather the wind may blow violently against one side of the house or other structure in which the furnace is installed. I have shown each of the tubes of the series 8 provided with a damper 15 at the point of its intersection with the flue 7 These are shown mounted on rods 16 having handles 17 at the front and rear of the furnace. Vnach rod controls a predetermined number of tubes, that is, each rod may carry one or more dampers. In this way any desired number of dampers may be closed regardless of the others and the heat is directed through the portion most exposed to the weather. This purpose is ,also aided by dividing each of the heads QWi'th a' central transverse partition 18.

From the foregoing it Will be seen'that there ispracticaily no restriction of the air on alli-'sidesinrradditiontothe heat units it 15 acquiresfrom-theeflues 8,'-l2.

IV clja'imfA asinyfinvention z.-k Y v p Y al. In a-nl airl'heaterfa casing 'having inlet and-outlet `duets-for thelatinospheric air, a furnace 'Wit-hin u s'aid easing', rva products lof thereim'ai head fat eithe'rsideof saidjlue,u lan upwardly; inclined tube leading from; said ias'snoa tube leading from the loWer end of said head to said iiue above said baiile.

In anair heater, the combination With thecasing having air inlets and outlets, of a furnace Within said casing, a products of combustion flue, vertically disposed from vthe tire: box of said furnace and having a heads and tubesbeing disposed inthe pas` sageof theailjthrouglr said casing.

-In testimony Whereoi'rIfS-have signed this speeiication. l'iin'y the lpresence of two subscribing Witnesses.

Copies ofthis patentmay be obtained for v'evcents cach, oy addressing th Commissioner o'fPtents, Washington, EL G, 

